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Resume now detects if a save has incompatible endianness.

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Eric S. Raymond 2023-04-06 19:35:56 -04:00
parent 4b08b726f9
commit 520d365f74
2 changed files with 12 additions and 1 deletions
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4
NEWS.adoc
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@ -2,6 +2,10 @@
// SPDX-FileCopyrightText: Eric S. Raymond <esr@thyrsus.com>
// SPDX-License-Identifier: CC-BY-4.0
Reoisitory head::
Savefiles now have an identigting magic cookie at the front.
Resume detects if a save has incompatible endianness.
1.15: 2023-04-03::
Commands in magic-word sequence now interrupt it, as in original.
Bug fix for bird not starting caged in endgame.

9
saveresume.c
View file

@ -18,6 +18,11 @@
#include "advent.h"
#include "dungeon.h"
/*
* Use this to detect endianness mismatch. Can't be unchanges by byte-swapping.
*/
#define ENDIAN_MAGIC 2317
struct save_t save;
#define IGNORE(r) do{if (r){}}while(0)
@ -28,6 +33,8 @@ int savefile(FILE *fp)
memcpy(&save.magic, ADVENT_MAGIC, sizeof(ADVENT_MAGIC));
if (save.version == 0)
save.version = SAVE_VERSION;
if (save.canary == 0)
save.canary = ENDIAN_MAGIC;
save.game = game;
IGNORE(fwrite(&save, sizeof(struct save_t), 1, fp));
@ -136,7 +143,7 @@ int restore(FILE* fp)
IGNORE(fread(&save, sizeof(struct save_t), 1, fp));
fclose(fp);
if (memcmp(save.magic, ADVENT_MAGIC, sizeof(ADVENT_MAGIC)) != 0)
if (memcmp(save.magic, ADVENT_MAGIC, sizeof(ADVENT_MAGIC)) != 0 || save.canary != ENDIAN_MAGIC)
rspeak(BAD_SAVE);
else if (save.version != SAVE_VERSION) {
rspeak(VERSION_SKEW, save.version / 10, MOD(save.version, 10), SAVE_VERSION / 10, MOD(SAVE_VERSION, 10));